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With Terra's step-by-step illustrated guide you will learn:
- How to measure the RI (refractive index) for singly and doubly refractive gemstones.
- How to use the RI measurements and the included RI Table to identify gemstone species.
- The limitations of the refractometer for gem identification.
- What is light refraction and why it is important.
- The parts of a refractometer and a simple explanation of how it works.
Only Terra's kits provide color images of what the user will see at every step.
Kit contents:
Refractometer with polarizing filter, separate narrow band monochromatic light source which works on AC and stores power in internal battery, bottle of 1.80 RI fluid, black carrying case for all of the above, 120 volt plug-in adapter.
PLUS one 9x7mm almandine garnet, one 7mm round peridot, one 8x6mm emerald cut amethyst, one Selvyt gemstone polishing cloth and a 22 page full-color booklet. All gems are in labeled gem jars.
NOTE: The USPS considers the RI fluid to be a hazardous liquid and requires that these items be packed under the supervision of a postal employee. This may cause a shipping delay of several days.
Already have a refractometer? Then try our:
Refractometer Gemstone Identification Activity Kit
Kit contents: one 9x7mm almandine garnet, one 7mm round peridot, one 8x6mm emerald cut amethyst, one Selvyt gemstone polishing cloth and a 22 page full-color booklet. All gems are in labeled gem jars.
(Note: This kit does NOT include a refractometer.
Dimensions: 6 3/4" x 5" x 1" (2 ounces)
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